OFFSET
1,5
FORMULA
T(n,n) = A000055(n+1).
EXAMPLE
Triangle begins:
n\d | 1 2 3 4 5 6
----+---------------------
1 | 1
2 | 1 1
3 | 1 4 2
4 | 1 15 12 3
5 | 1 54 105 39 6
6 | 1 221 863 566 117 11
CROSSREFS
KEYWORD
AUTHOR
Pontus von Brömssen, Sep 09 2023
STATUS
approved